Respuesta :

f(x) = a(x - h)2 + k
f(x) = a(x + 2)2 - 7

(0,-3)
-3 = a(0 + 2)2 - 7
4 = a(2)2
4 = 4
1 = a
f(x) = 1(x + 2)2 - 7 = x2 + 4x - 3